對於大量項目，宏失敗

Question

我有一個運行宏，在大量項目上運行時看似隨機點失敗。宏通過接收錯誤日誌的收件箱文件夾，用來循環，保存錯誤日誌的文本文件，複製從附件文本的指定行（錯誤操作名稱和等），將這些字符串中的Excel文件來跟蹤它們，然後將電子郵件項目移動到另一個收件箱文件夾中。當它通過少於100封電子郵件時，它的效果很好，但最重要的是它很奇怪。在第122次迭代測試失敗時，648,350等。總體結構如下。

Sub ErrorLogAuto() 

Dim FileName As String 
Dim Path As String 
Dim TimeInfo As String 
Dim SubjectInfo As String 
Dim IdNumber As String 
Dim Dataline As String 

Dim oItem As Object 
Dim Item As Outlook.Items 
Dim myAttachment(1000) As Outlook.Attachments 
Dim myInspector As Outlook.Inspector 

Dim appExcel As Object 

Dim FileNum As Integer 
Dim found As Integer 
Dim found1 As Integer 
Dim found2 As Integer 
Dim i As Integer 
Dim j As Integer 
Dim op As Integer 
Dim us As Integer 
Dim cdata As Integer 

i = 0 
k = 1 

'Returns proper SOURCE folder 
Set myNameSpace = Application.GetNamespace("MAPI") 
Set myFolder = myNameSpace.GetDefaultFolder(olFolderInbox) 
Set myNewFolder = myFolder.Folders("Test") '--> text between "" is the folder name, only change it here 

'set path for attachments to be saved in 
Path = "C:\test\" 

'Set item = to all emails in test folder 
Set Item = myNewFolder.Items 

'If no emails... 
If Item.Count = 0 Then 
    MsgBox "There are no error messages to sift through." 
    Exit Sub 
End If 

'Open an instance of excel to certain workbook 
Set appExcel = CreateObject("Excel.Application") 
appExcel.Visible = True 
'appExcel.Workbooks.Open (Path & "test.xlsx") 
appExcel.Workbooks.Open (Path & "SAMPLE FILE NAME.xlsx") 

'Find first empty cell to write to --> based off of column D 
While appExcel.Range("D" & k) <> "" 
    k = k + 1 
Wend 

'For every email in folder...here starts the big loop 
For Each oItem In Item 

    'Save attachment and set filename 
    Set myAttachment(i) = oItem.Attachments 
     myAttachment(i).Item(1).SaveAsFile Path & myAttachment(i).Item(1).DisplayName & ".txt" 
     FileName = Path & myAttachment(i).Item(1).DisplayName & ".txt" 

    'Subject and time info 
    SubjectInfo = oItem.Subject 
    TimeInfo = oItem.ReceivedTime 

    'Returns ID number from subject string after '@' 
    j = InStr(SubjectInfo, "@") 
    IdNumber = Mid(SubjectInfo, j + 1) 

    'Write IdNumber to cell and timestamp 
    appExcel.Range("A" & k) = TimeInfo 
    appExcel.Range("D" & k) = IdNumber 


    'Open the notepad file, read line by line until EOF, take user message, and take operation name 
    FileNum = FreeFile() 
    Open FileName For Input As #FileNum 

    While Not EOF(FileNum) 

     Line Input #FileNum, Dataline 

     'If string found these will <> 0 
     found = InStr(Dataline, "<OperationName>") 
     found1 = InStr(Dataline, "<UserMessage>") 
     found2 = InStr(Dataline, "<UserMessage><![CDATA[") 

     'Returns position right after where string is found 
     op = InStr(Dataline, "<OperationName>") + 15 
     us = InStr(Dataline, "<UserMessage>") + 13 
     cdata = InStr(Dataline, "<UserMessage><![CDATA[") + 22 

     'Found operation name line 
     If found <> 0 Then 
      'appExcel.Range("B1") = Dataline --> whole line 
      'appExcel.Range("C" & k) = Mid(Mid(Dataline, 20), 1, Len(Mid(Dataline, 20)) - 16) --> doesnt account for whitespace 
      appExcel.Range("N" & k) = Mid(Mid(Dataline, op), 1, Len(Mid(Dataline, op)) - 16) '--> accounts for whitespace and cuts out <OperationName> and <\OperationName> 
     'Found user message line and it includes cdata stuff 
     ElseIf found1 <> 0 And found2 <> 0 Then 
      'appExcel.Range("C1") = Dataline --> whole line 
      'appExcel.Range("D" & k) = Mid(Mid(Dataline, 20), 1, Len(Mid(Dataline, 20)) - 14) --> doesnt account for whitespace 
      'appExcel.Range("O" & k) = Mid(Mid(Dataline, us), 1, Len(Mid(Dataline, us)) - 14) --> accounts for whitespace and cuts out <UserMessage> and <\UserMessage> 
      appExcel.Range("O" & k) = Mid(Mid(Dataline, cdata), 1, Len(Mid(Dataline, cdata)) - 17) '--> accounts for whitespace and cuts out <UserMessage><![CDATA[ and ]]><\UserMessage> 
     'Found user message line WITHOUT cdata stuff 
     ElseIf found1 <> 0 Then 
      appExcel.Range("O" & k) = Mid(Mid(Dataline, us), 1, Len(Mid(Dataline, us)) - 14) '--> accounts for whitespace and cuts out <UserMessage> and <\UserMessage> 
     End If 

    Wend 

    Close #FileNum 

    i = i + 1 
    k = k + 1 

Next 

Call FolderMove 


End Sub 

Private Sub FolderMove() 

    Dim a As MailItem 
    Dim m As Integer 
    Dim Source As MAPIFolder 
    Dim Destination As MAPIFolder 

    Set Source = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox) 
    Set Source = Source.Folders("Test") '--> text between "" is the folder name, only change it here 

    Set Destination = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox) 
    Set Destination = Destination.Folders("Testing Done") '--> text between "" is the folder name, only change it here 

    For m = Source.Items.Count To 1 Step -1 
     Set a = Source.Items(m) 
     a.move Destination 
    Next 

End Sub 

代碼在非EOF循環中讀取文件時發生故障。這些錯誤是由糟糕的編程習慣造成的嗎？我從來沒有使用過大套，並且是VBA的新手，所以任何幫助將不勝感激。

錯誤信息：運行時錯誤'50290'：應用程序定義的或對象定義的錯誤。 - >在第363次迭代時發生

在調試時重新啓動並在達到540之前以相同的方式失敗。

然後我重新啓動，它完成了。

所以現在我的問題是爲什麼會發生這種情況？

Answer 1

在聯機配置文件中（與緩存相反），Exchange將限制您可以打開的項目的數量（默認爲250）。您需要確保通過將對象設置爲Northing（VBA）或調用來顯式釋放對象Marshal.ReleaseComObject的在.NET。你也應該確保你不使用多點符號，以避免你不能明確地釋放隱含變量。

for i = 1 to Item.Count 
    set oItem = Item.Items(i) 
    set oAttachments = oItem.Attachments 
    if oAttachments.Count > 0 Then 
    set oAttachment = oAttachments.Item(1) ' do you really want a loop through all attachments? 
    FileName = Path & oAttachment.FileName 
    oAttachment.SaveAsFile FileName 
    set oAttachment = Nothing 
    End If 
    ... 
    set oAttachments = Nothing 
    set oItem = Nothing 
Next i